Processing information in the image plane.

Research output: Contribution to journalArticlepeer-review

Abstract

Two data processing techniques for the interrogation of the image plane of PIV photographs are described. The orthogonal image compression technique, which incorporates image shifting, works well provided that the image density is low. It is capable of accuracy better than 1% and it is very fast. Without using an array processor, a typical photograph takes only one minute to analyse (0.03 seconds per point). The disadvantage is that low image density inevitably results in random locations of data and loss of data. The 2-dimensional spatial correlation technique yields over 95% good data and should be as accurate as orthogonal image compression. This technique is very robust. Using an array processor an interrogation spot can be analysed by correlation in less than one second. This system is currently being modified to compute the correlation by fast Fourier transform (FFT) analysis of the Young's fringes. Speeds of the order of 0.28 seconds per spot have been achieved. (from authors' abstract)

Original languageEnglish (US)
Journal[No source information available]
StatePublished - Jan 1 1988
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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